Concentrator.



L. BOWBRMAN.

CONGENTRATOR.

APPLICATION mum NOV.12, 1913.

1,1 18,393. Patented Nov. 24, 1914.

7145 NORRIS PETERS 60.. PHOTOJ-ITHOH WASHINGTON. l]v C,

- UNITED STATE S LOUIS BOWERMAN, 0F PORTLAND, OIREGON.

CONCENTRATOR.

The object of my invention is to produce certain improvements in concentrators,

whereby the separation of dry ores is facilitated.

separating substancesof different specific gravlt es in substant ally pulverulcnt form as to portions thereof at least, and consists of means for effecting such separation more expeditiously and thoroughly than by those inordinary use.

In the accompanying drawing: Figure 1 is a perspective view partially broken away,

of a concentrator box embodying my invention. Fig. 2 is a partial longitudinal vertical section of the subject matter of Fig. 1,

on an enlarged scale and which in connection with Fig. 3 illustrates the details of my invention. Fig. 3 is a section of my device taken as upon the line A--A of Fig. 2.

Referring to the numerals on the drawing, 1 indicates the inclined floor of a concentrator topframe 5, which is set upon top of a box 8 to which it is removably fixed in use as by depending strips 6. The box 8 is divided by transverse partitions 19 spaced to accommodate drawers 7, which respectively slide between a partition and a guide plate 13. The top 5, is adapted to be vibrated upon the upper edges of the partitions 19, to impart motion to the material carried upon it. v

The floor 1, besides being provided with a series of projections 2 preferably in staggered arrangement or other suitable means for spreading the material to be separated evenly upon the floor, has a series of rifiies composed of properly spaced-bars. Each series lies flush with the floor, but may be disposed at diflerent angles to its longitudinal axis. Those indicated by the numeral 3 are at right angles and those indicated by 4 are at oblique angles to said axis. Otherwise the bars of the different series may be indentical inshape and as indicated by 3 in Fig. 2.

Each series of riflles is superposed above a drawer 7 into which delivery from its riflies My invention relates to apparatus for Specification of Letters Patent. PatentedNop 24,1914 Application filed November 12, 1913. Serial No. 800,508.

is made through a chute defined asby side pieces 11 and 12 secured to the bottom of the floor 1 and transversely thereto. The side piece 12 is preferably sustainedby the con{ tiguous back piece 11. The pieces 11 make close joints against the upperedges of partitions 19, therebyconstituting of eachdrawcr compartment a chamber offsubstantially air-. tight fitments with exceptiongofthe open bar tops. i i i i In the rear of the several drawers 7 is an air chamber 20 defined in the lower corner of the box 8 by inclinedpartition wall 21, having a door 18 for each drawer. Each door is hinged as indicated at 15 and is also providedwithla wing screw 16 that impinges againstthe door below its hinge in such. manner as to admit of opening and closing the door from the outside of the box 8 through manipulation of the screw.

WVith the chamber 20 communicates an air supply pipe 17 which is provided for delivery of air under pressure, from a source not illustrated, to the chamber.

For the accommodation of the respective rifllcs open spaces in the floor 1 are provided of an extent to conform to that of the rillles and bounded on opposite sides with lips 9 i and 10 which lie parallel and in close juxtaposition to the bars of the riflle, as indicated by 3 inFig. 2.

The bars 3 are spaced equally with respect to one another and to the lips 9 and 10, and are of the shape in cross-section illustrated in Fig. 2, wherein, as appears, the upper forward angle a of each defines with the next adjacent member a constricted air discharge slit. Each angle a is depressed below the plane of the floor 1 so as to form on top of each bar 3 a pocket of longitudinal extent coextensive with the bar that leads toward its air discharge slit. The constriction of the slit, due to the widening space below the angle a between the walls of the adjacent bars, lends the effect of a discharge nozzle to each slit, thereby concentrating the force of the air discharge through the slit and so facilitatingand promoting the separation which the device is designed to effect. It also prevents the clogging of materials betweenthe bars and produces a regular upward current of the air, preventing side cur,

rents, and the inclination of the upper sur-.

adapted to agitate it or it may be manually agitated, and it is supplied upon the upper part of the floor with the raw mater al, such material being spread evenly over the floor by the projections 2 passes in a thinsheet over the rifiles. At each slit between the bars 3 of the rifiies it meets an air blast supplied Within the chamber 20 from the pipe 17. The force of the air discharge from each slit, being as previously specified, augmented by the constriction of the slit, serves to drive out the lighter particles of the pulverulent mass of material while the heavier particles, or in other words the ore, dropby gravity into a drawer 7 underneath, whence it may be taken upon opening of the drawer. By aid of the wing screws 16 the supply of air to each drawer compartment may be regulated to any required extent. Different sizes of bars 3 may be used with the effect of enlarging or diminishing the gage of the slits as desired, the bars being topics of this patent may be obtained for relation in a common plane therein, each I bar having a substantially vertical front face, a rearwardly inclined upper face and a rear face inclining forwardly from said upper face, means for delivering air currents upwardly between the bars, and means for feeding materialin distributed form tosaid bars.

Intestimony whereof I my signature in presence of two witnesses. v LOUIS BOWERMAN.

Witnesses:

EDWIN E. HEOKBERT, A. J. MATTER.

five cents each. by addressing the Commissioner of Patents,

Washington, D. C. 

